Slightly better graphics card (difference is probably un-noticeable) but it does have DX11 support which might make a noticeable difference in WoW. That triple core is probably on par with the dual core when it comes to gaming performance.
If you are going to buy from newegg, at least get something decent:
http://www.newegg.com/Product/Produc...82E16834215003
Fast i3 dual core with the fastest graphics card you can get in a new laptop under $750.
If you don't mind getting a refurb one, this one will outperform anything in its price range:
http://www.newegg.com/Product/Produc...82E16834220733
Asus is a really good brand so you can't go wrong with them. A 260GTX is a high end graphics card and it has a pretty fast dual core CPU.
If you have the ability to order from newegg, there is no reason not to. I'm not sure what the AUD to USD exchange rate is, but the deals you have in Australia seem terribly overpriced and the offers are terribly outdated.
With proper care and maintenance, it is almost impossible for your laptop hardware to fail nowadays, the majority of the problems you might encounter are software problems. You can usually solve these with the help of the internet forums or if worse comes to worse, you can take it to any shop and get ripped off.